The world's largest wooden structure.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

Commonly acknowledged as the only public monument to the Devil himself.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

An ancient Egyptian temple in the middle of Madrid, Spain.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

Keshwa chaca, among the last handwoven Incan bridges, crosses Apurimac Canyon in Peru.

A set of ancient drawings in the desert of Peru that are so massive, many of them can only be fully seen from the sky.

Nazca pilgrimage site covering 370 acres is a popular stop for archeologists and looters.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

White llama terraces dazzle in Peru's "other Machu Picchu."

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

Extraordinary rock formations in open Peruvian fields.

A mysterious pre-Incan ruin believed to have miraculous healing powers.

Beautiful public park off the beaten path and away from tourists.

Crumbling remnant of Rio's colonial past tucked behind Corcovado mountain in the neighborhood of Cosme Velho.

An ancient monastery, a locked room, and a mysterious book heist.

Quirky castle designed by the American actor best known for portraying Sherlock Holmes on stage.

Scene of the grisly murder of two Norwegian women in 1873.

This crescent-shaped sliver of sand is a magical haven for a herd of feral horses.

Rusty red sands line the shores of this Canadian Province.

Oldest existing church in New York and the inspiration for Washington Irving's "The Legend of Sleepy Hollow."

A castle built for love, and abandoned due to heartbreak.

Taxidermy of the racing horse with a huge heart, who inspired hope in the Depression.